Children who are established patients, 4-18 years old, and present to the NeuroDevelopmental Science Center for a follow-up office visit during the study period, since a diagnosis will be available at the time of the study (patients in the lab study may be new patients if they have a diagnosis at the time their lab work is prescribed). The NeuroDevelopmental Science Center at Akron Children's Hospital provides nearly 25,000 visits annually to children and youth affected by neurological, developmental, and behavioral disorders. This includes children with autism, intellectual disabilities, physical disabilities, learning disabilities, epilepsy and other neurological conditions.